Bike wheels
I also advocate holding a bike wheel horizontal by the axle (one hand on top, one underneath), getting someone to spin it and then see how hard it is to tilt it. You'll get the feel for precession.
I personally think Trevor Thom explains things brilliantly in all his manuals, but specifically gyros are dealt with in The Air Pilots Manual Book 4, - The Aircraft - Technical. It's back to basics, but if you just don't get it, that's a great place to start.
Hope that helps.